Summary:
The original proguard rules are put in the template, which is not very convenient and easy to get wrong. Because new rules get put, people also has two copy paste the rule. And there are also existing project import react native as a dependency. So the best way to keep a android library project proguard rule is to manage the rule itself, using `consumerProguardFiles` like [dagger](46baef6d96/butterknife/build.gradle (L9)) and other android library project.
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Use RNTester to build the release flavor (now it has bugs https://github.com/facebook/react-native/issues/18460, I keep my change in local for now), after build success, run to check if crash.
In the process, I also fix https://github.com/facebook/react-native/issues/12994 and https://github.com/facebook/react-native/issues/6624 by adding the following to proguard rules
```proguard
-keep,includedescriptorclasses class com.facebook.react.bridge.** { *; }
```
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[ANDROID] [ENHANCEMENT and BUGFIX] [Proguard rules] - inline and fix proguard rules .
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CATEGORY
[----------] TYPE
[ CLI ] [-------------] LOCATION
[ DOCS ] [ BREAKING ] [-------------]
[ GENERAL ] [ BUGFIX ] [ {Component} ]
[ INTERNAL ] [ ENHANCEMENT ] [ {Filename} ]
[ IOS ] [ FEATURE ] [ {Directory} ] |-----------|
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[IOS] [BREAKING] [FlatList] - Change a thing that breaks other things
[ANDROID] [BUGFIX] [TextInput] - Did a thing to TextInput
[CLI] [FEATURE] [local-cli/info/info.js] - CLI easier to do things with
[DOCS] [BUGFIX] [GettingStarted.md] - Accidentally a thing/word
[GENERAL] [ENHANCEMENT] [Yoga] - Added new yoga thing/position
[INTERNAL] [FEATURE] [./scripts] - Added thing to script that nobody will see
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Closes https://github.com/facebook/react-native/pull/18461
Differential Revision: D7527533
Pulled By: hramos
fbshipit-source-id: 447dbc16983bcfb597187b40c1be3987a8c5a832
gengjiawen